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I did a live chat with one CF tube supplier in mainland China through alibaba. It was an interesting experience and a real eye opener for me how global commerce works these days. I was asking what sizes they could make, she told me to wait while she walked out to the factory to measure the mandrels for me.
They were happy to make one unit and ship it, provided they already had the correct size mandrel. I could have whatever thickness and quality I wanted - obviously thicker or better tolerance on the thickness cost more.
I found out making a new mandrel is very expensive and in my case they didn't have the size I wanted.
James
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